<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
  /* 选不选中 css 状态 */
  /* .custom-text-selection::selection {
    background: deeppink;
    color: white;
  } */
  * {
    margin: 0;
    padding: 0;
  }
  body {
    /* < 480 mobile */
    min-width: 550px; /*PC*/
    font-weight: bold;
    font-size: 20px;
  }
  #header, #footer {
    background:rgba(29, 27, 27, 0.726);
    text-align: center;
    height: 60px;
    line-height: 60px;
  }
  #container {
    padding-left: 200px;
    padding-right: 150px;
    overflow: hidden;
  }
  #container .column {
    position: relative;
    float: left;
    text-align: center;
    height: 300px;
    line-height: 300px;
  }
  #center {
    width: 100%;
    background: rgb(206, 201, 201);
  }
  #left {
    width: 200px;
    right: 200px;
    background-color: rgba(95, 179, 235, 0.972);
    margin-left: -100%;
  }
  #right {
    width: 150px;
    background-color: rgb(231, 105, 2);
    right: -150px;
    margin-left: -150px;
  }

  </style>
</head>
<body>
  <!-- <p class="custom-text-selection">select some of this text</p> -->
  <div id="header">#header</div>
  <div id="container">
    <!--  三列式布局  PC 中间的内容放在前面  
    你是如何看到页面的？ 
    -->
    <div id="center" class="column">#center</div>
    <div id="left" class="column">#left</div>
    <div id="right" class="column">#right</div>
  </div>
  <div id="footer">#footer</div>
</body>
</html>
